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Sorption Characteristics of Caffeine onto Untreated Polyurethane Foam: Application to Its Determination in Human Plasma

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Abstract

In the present paper, the sorption properties of caffeine (CAF) onto polyether type polyurethane foam (PUF) as solid phase sorbent were investigated with UV determination at 274.3 nm. Batch and column methods were used to optimize chemical, flow, kinetic and isothermal conditions for preconcentration of CAF. Results indicated quantitative sorption of CAF at pH 8 and 30 min shaking time. The maximum sorption capacity was found to be 4.1 mg g−1. Column preconcentration was recommended at a flow rate of 1.5 mL min−1 and desorption with 4 mL from 0.15 mol L−1 hydrochloric acid. The procedure provided a linear analytical range of 0.05 – 30 mg L−1. The detection and quantification limits are 0.016 and 0.047 mg L−1, respectively. The procedure was applied to determination of CAF in spiked human plasma. The obtained recoveries were 98 – 101% and RSD values were from 0.05 to 9.5%.

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Authors and Affiliations

  1. Chemistry Department, Faculty of Science, Fayoum University, Fayoum, Egypt

    Samy M. Abdel Azeem

  2. Chemistry Department, Faculty of Science, Ain-Shams University, Abasia Street, 11566, Cairo, Egypt

    Samah Ali & Mohamed F. El-Shahat

Authors
  1. Samy M. Abdel Azeem
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  2. Samah Ali
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  3. Mohamed F. El-Shahat
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Correspondence to Samah Ali.

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Abdel Azeem, S.M., Ali, S. & El-Shahat, M.F. Sorption Characteristics of Caffeine onto Untreated Polyurethane Foam: Application to Its Determination in Human Plasma. ANAL. SCI. 27, 1133–1137 (2011). https://doi.org/10.2116/analsci.27.1133

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  • DOI: https://doi.org/10.2116/analsci.27.1133

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